†class Paracrinoidea Regnell 1945
Parent taxon: Blastozoa according to A. B. Smith 1984
See also Beaver et al. 1967, Parsley 1981 and Sepkoski 2002
Sister taxa: Asteroblastida, Blastoidea, Crinoidea, Diploporita, Eocrinoidea, Glyptosphaeritida, Lepidocystoidea, Parablastoidea, Rhombifera, Rhombifera, Soluta, Sphaeronitida
Subtaxa: Comarocystitida Heckeritidae Platycystitida Springerocystidae
Ecology: stationary epifaunal suspension feeder